Dr. Ooi Wei Seong

Medical Oncology
Lungs, breasts, head & neck, & genitourinary cancers
Specialist: Oncology (Medical)

MB BCh BAO (Ireland), Bachelor of Medicine (UK), Bachelor of Surgery (UK), MRCP (UK) Member of Royal College of Physicians (UK)

Education & Training

Dr Ooi Wei Seong is a medical oncologist who graduated from Trinity College Dublin with honours and distinction in 1999. He started his oncology training at St Vincent’s University Hospital in Dublin under Prof John Crown, a prominent cancer researcher, and then spent three years at Sunnybrook Odette Cancer Centre in Toronto, Canada as a clinical fellow with Dr Kathy Pritchard, a key opinion leader on breast cancers. He returned to Singapore and obtained his specialist accreditation in medical oncology. He continued seeing breast, colon and lung cancer patients at the National Cancer Centre, in addition to gynaecological cancer clinic at KK Women’s and Children’s Hospital.

Areas of Expertise

Dr Ooi has keen interest in breast, gastro-intestinal, lung, head & neck, and genitourinary cancers. In addition to the management of all solid tumour types, he also has keen interest in bone health and mechanisms of bone metastases in cancer patients. Dr Ooi was the re-cipient of the Singapore Health Quality Service Award in 2011 for his exemplary service to patients.

Research & Teaching

Dr Ooi was actively involved with multiple clinical trials, and has contributed to many publi-cations in peer-reviewed journals. His research has been presented at various international oncology meetings. He has given talks on latest cancer treatment to regional oncologists and general practitioners. He has also spoken at local GP symposiums and conducted work-shops for patients, given public talks on various cancers. He was a Clinical Tutor at Yong Loo Lin School of Medicine; in addition to providing teachings to junior doctors, nurses, Duke-NUS students and elective fellows.

Present Clinical and Academic Appointments

Medical Director, International Cancer Specialists (ICS)
Visiting Consultant, Raffles Hospital

Past Appointments

Visiting Consultant, National Cancer Centre, Singapore
Visiting Consultant, KK Women’s and Children’s Hospital
Clinical Educator, Yong Loo Lin School of Medicine NUS
Oncology Consultant, Harley Street Clinic Singapore


Singapore Health Quality Award 2011


Mt Elizabeth Orchard Hospital
Mt Elizabeth Novena Hospital
Gleneagles Hospital
Farrer Park Hospital
Parkway East Hospital
Mt Alvernia Hospital
Concord International Hospital
Raffles Hospital